Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea
Submerged landscapes on continental shelves archive drainage networks formed during periods of sea-level lowstand. The evolution of these postglacial drainage networks also reveals how past climate changes affected the landscape. Ice-marginal and paraglacial drainage networks on low-relief topograph...
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Copernicus Publications
2020
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Online Access: | https://doi.org/10.5194/esurf-8-869-2020 https://doaj.org/article/31d2fe22f98647e4933e12a5efaf7c82 |
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ftdoajarticles:oai:doaj.org/article:31d2fe22f98647e4933e12a5efaf7c82 2023-05-15T16:40:19+02:00 Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea A. R. Emery D. M. Hodgson N. L. M. Barlow J. L. Carrivick C. J. Cotterill J. C. Richardson R. F. Ivanovic C. L. Mellett 2020-10-01T00:00:00Z https://doi.org/10.5194/esurf-8-869-2020 https://doaj.org/article/31d2fe22f98647e4933e12a5efaf7c82 EN eng Copernicus Publications https://esurf.copernicus.org/articles/8/869/2020/esurf-8-869-2020.pdf https://doaj.org/toc/2196-6311 https://doaj.org/toc/2196-632X doi:10.5194/esurf-8-869-2020 2196-6311 2196-632X https://doaj.org/article/31d2fe22f98647e4933e12a5efaf7c82 Earth Surface Dynamics, Vol 8, Pp 869-891 (2020) Dynamic and structural geology QE500-639.5 article 2020 ftdoajarticles https://doi.org/10.5194/esurf-8-869-2020 2022-12-31T13:53:26Z Submerged landscapes on continental shelves archive drainage networks formed during periods of sea-level lowstand. The evolution of these postglacial drainage networks also reveals how past climate changes affected the landscape. Ice-marginal and paraglacial drainage networks on low-relief topography are susceptible to reorganisation of water supply, forced by ice-marginal rearrangement, precipitation and temperature variations, and marine inundation. A rare geological archive of climate-driven landscape evolution during the transition from ice-marginal (ca. 23 ka) to a fully submerged marine environment (ca. 8 ka) is preserved at Dogger Bank, in the southern North Sea. In this study, our analysis of high-resolution seismic reflection and cone penetration test data reveal a channel network over a 1330 km 2 area that incised glacial and proglacial lake-fill sediments. The channel network sits below coastal and shallow marine sediments and is therefore interpreted to represent a terrestrial drainage network. When mapped out, the channel form morphology reveals two distinct sets. The first set comprises two low-sinuosity, wide ( >400 m) channels that contain macroforms of braid and side bars. These channels are interpreted to have originated as proglacial rivers, which drained the ice-sheet margin to the north. The second set of channels (75–200 m wide, with one larger, ∼400 m wide) has higher sinuosity and forms a subdendritic network of tributaries to the proglacial channels. The timing of channel formation lacks chronostratigraphic control. However, the proglacial rivers must have formed as the ice sheet was still on Dogger Bank, before 23 ka, to supply meltwater to the rivers. Ice-sheet retreat from Dogger Bank led to reorganisation of meltwater drainage and abandonment of the proglacial rivers. Palaeoclimate simulations show a cold and dry period at Dogger Bank between 23 and 17 ka. After 17 ka, precipitation increased, and drainage of precipitation formed the second set of channels. The second set of ... Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Dogger Bank ENVELOPE(2.333,2.333,54.833,54.833) Earth Surface Dynamics 8 4 869 891 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Dynamic and structural geology QE500-639.5 |
spellingShingle |
Dynamic and structural geology QE500-639.5 A. R. Emery D. M. Hodgson N. L. M. Barlow J. L. Carrivick C. J. Cotterill J. C. Richardson R. F. Ivanovic C. L. Mellett Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea |
topic_facet |
Dynamic and structural geology QE500-639.5 |
description |
Submerged landscapes on continental shelves archive drainage networks formed during periods of sea-level lowstand. The evolution of these postglacial drainage networks also reveals how past climate changes affected the landscape. Ice-marginal and paraglacial drainage networks on low-relief topography are susceptible to reorganisation of water supply, forced by ice-marginal rearrangement, precipitation and temperature variations, and marine inundation. A rare geological archive of climate-driven landscape evolution during the transition from ice-marginal (ca. 23 ka) to a fully submerged marine environment (ca. 8 ka) is preserved at Dogger Bank, in the southern North Sea. In this study, our analysis of high-resolution seismic reflection and cone penetration test data reveal a channel network over a 1330 km 2 area that incised glacial and proglacial lake-fill sediments. The channel network sits below coastal and shallow marine sediments and is therefore interpreted to represent a terrestrial drainage network. When mapped out, the channel form morphology reveals two distinct sets. The first set comprises two low-sinuosity, wide ( >400 m) channels that contain macroforms of braid and side bars. These channels are interpreted to have originated as proglacial rivers, which drained the ice-sheet margin to the north. The second set of channels (75–200 m wide, with one larger, ∼400 m wide) has higher sinuosity and forms a subdendritic network of tributaries to the proglacial channels. The timing of channel formation lacks chronostratigraphic control. However, the proglacial rivers must have formed as the ice sheet was still on Dogger Bank, before 23 ka, to supply meltwater to the rivers. Ice-sheet retreat from Dogger Bank led to reorganisation of meltwater drainage and abandonment of the proglacial rivers. Palaeoclimate simulations show a cold and dry period at Dogger Bank between 23 and 17 ka. After 17 ka, precipitation increased, and drainage of precipitation formed the second set of channels. The second set of ... |
format |
Article in Journal/Newspaper |
author |
A. R. Emery D. M. Hodgson N. L. M. Barlow J. L. Carrivick C. J. Cotterill J. C. Richardson R. F. Ivanovic C. L. Mellett |
author_facet |
A. R. Emery D. M. Hodgson N. L. M. Barlow J. L. Carrivick C. J. Cotterill J. C. Richardson R. F. Ivanovic C. L. Mellett |
author_sort |
A. R. Emery |
title |
Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea |
title_short |
Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea |
title_full |
Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea |
title_fullStr |
Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea |
title_full_unstemmed |
Ice sheet and palaeoclimate controls on drainage network evolution: an example from Dogger Bank, North Sea |
title_sort |
ice sheet and palaeoclimate controls on drainage network evolution: an example from dogger bank, north sea |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/esurf-8-869-2020 https://doaj.org/article/31d2fe22f98647e4933e12a5efaf7c82 |
long_lat |
ENVELOPE(2.333,2.333,54.833,54.833) |
geographic |
Dogger Bank |
geographic_facet |
Dogger Bank |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Earth Surface Dynamics, Vol 8, Pp 869-891 (2020) |
op_relation |
https://esurf.copernicus.org/articles/8/869/2020/esurf-8-869-2020.pdf https://doaj.org/toc/2196-6311 https://doaj.org/toc/2196-632X doi:10.5194/esurf-8-869-2020 2196-6311 2196-632X https://doaj.org/article/31d2fe22f98647e4933e12a5efaf7c82 |
op_doi |
https://doi.org/10.5194/esurf-8-869-2020 |
container_title |
Earth Surface Dynamics |
container_volume |
8 |
container_issue |
4 |
container_start_page |
869 |
op_container_end_page |
891 |
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1766030705821745152 |